Delayed acting power lift



Dec. 26, 1950 D. K. M GEHEE DELAYED ACTING POWER LIFT 2 Sheeis-Shet. 1

Filed Augv 25, 1946 D. K. M GEHEE DELAYED ACTING POWER LIFT Dec. 26,1950 Filed Aug. 25, 1946 2 SheetsSheet 2 31 WW agiq' 711/70 69/166,

Patented Dec. 26, 1950 UNITED STATES PATENT OFFICE 2,535,441 amen)'AeTINo POWER LIFT David K. McGehee, Canyon, Tex. Athenian negates,1946-, Serial No. 692,414

1 cars.

The invention relates to a power lift'generally, and more especiallyto a"delayedja'ctl'ng power lift for ground working fa'rrnimplenier'its,such as plows, cultivators or the like hitched to a draft medium. i

The primary object of the invention is "the provision of a lift of thischaracter; wherein through its connection with the tongue of a plow,cultivator or oth'efgro'uhd' working implement should the latter underpull thereof by a draft n'i'edium have its groimd. working element meetabnormal resistance, it, through delayed action, will be raised nearerthe grtiun'd, the lift being of novel construction, and it is arefinement over the subject matter of Letters Patent No. 2,297,788,issued on or about October 6, 1942.

Another object of the invention is the provision of a lift ofthisjcharacter; wherein when the ground working element of an implementis out of the ground its weight through gravity "will force it backagain for groun working purposes, the lift being unique in assemblyandarrangement in its connection with a farming implement.

A further object of the invention is the provision of a lift of thischaracter, wherein the ground working implement can be regulated toassume a ground working position for either shallow or deep work, thelift also being under the control of an operator of the implement.

A still further object of the invention is the provision of a lift ofthis character, wherein it is adaptable for any and all types of groundworking machinery, and it is possessed of few parts, thus economical inreplacements and repairs.

A still further object of the invention is the provision of a lift ofthis character, which is simple in construction, thoroughly reliable andefiicient in operation, strong, durable, readily and easily operated,automatic in the working thereof, easily applied and removed to and froman implement, and inexpensive to manufacture.

With these and other objects in view the invention consists in thefeatures of construction, combination and arrangement of parts as willbe hereinafter more fully described, illustrated in the accompanyingdrawings, these disclosing the preferred embodiment of the invention,and as pointed out in the claim hereunto appended.

In the accompanying drawings:

Figure 1 is a side elevation of a farming im plement with the liftconstructed in accordance with the invention applied thereto with theground working element in normal working position.

Figure 2 is a view similar to Figure 1 showing the lift regulated fordelayed lifting action.

Figure 3 is a view similar to Figure 2 showing the ground workingelement lifted by the delayed action.

Figure 4 is a fragmentary side elevation, partly in section or brokenaway, at the latching area of the lift. Figure 5 is a sectional viewtaken on the line 5-5 of Figure 4 looking in the direction of thearrows.

Similar reference characters indicate corresponding parts throughout theseveral views. in the drawings. v

7 Referring to the drawings in detail, A designates generally a portionof a ground working implement, for example, a plow or cultivator, inthis instance representative of a cultivator, having a ongue l9 which atits rear supports a share standard I! carrying a ground working element1.2-, the tongue H] being fitted with a cranked axle E3 on each end ofwhich isjournaleda ig'round wheel M, the cranked axle is being turnablevertically, so that the implement A .will be raised, or lowered andcorrespondingly the ele- Beneath the fore portion of the tongue ID,parallel therewith, is a slidable draft bar l5 movably fitted in asleeve-like guide bearing I6, which is fixed at H, to the forward end ofthe tongue it, the rear end of the said bearing I6 being formed with anoutturned annular flange i8, against which is engaged a resilientcushioning collar 19, while fixedly held on the member or bar i5 is anannular abutment or stop ring 20 for contact with the collar is when thebar l5 has advanced relative to the tongue H).

The tongue ll] at the forward end has connected thereto by a pivot 2! ahand released latch 22 which is adapted for vertical swinging movementsand a keeper 23 of this latch is designed for releasable engagement inselected latching notches 24 provided in the bar [5, so that the lattercan be latched in determined positions with relation to the said tongueID, as will best appear in Figure 4 of the drawings.

At the fore end of the bar I5 is an adjustable hitch 25 for couplingwith a draft medium, such as a tractor or the like, not shown, and thishitch may be of any selected type or construction.

Fixed to the crank portion of the axle I3 is an upstanding turning arm25 which has adjustable connection therewith at selected points 21 adetachable chain 28, it being coupled at 29 at the forward end 29 to aswingable arm 30 which is (connected by a pivot 3| to the tongue l0.This arm 30 through a link connection 32 with a throw lever 33, pivotedat 34, can be rocked for the swinging of the arm 26, the lever 33 beingheld in an adjusted position by a hand released latch 35 coacting with akeeper segment 36 rigid upon the said tongue I 0.

The draft bar l at its rearmost end has an upstanding post 31 to whichis connected a delayed acting lift spring 38 which at its rearmost endhas a coupling at 39, selectively, with the arm 26, the spring in thisinstance being of the coiled retractile type.

The lift as a whole will work on most ground working implements and itsground engaging element by its own weight will remain engaged in thesoil. Through the use of the spring 38 the said element remains in theground until the draft medium has stretched sufiiciently to lift theelement l2 completely out of the ground.

The arm 26 at or near its uppermost end is provided with a hook 40 whichis designed for the attachment of a suitable connection, not shown,adapting it for releasable engagement with the arm 38 so that theelement I2 can be held in a raised position with respect to the groundand thus holding it out of working engagement therewith when desired.

The bar l5 can be latched in varying adjusted positions to regulate thedelayed action of the lift.

The lever 33 with the chain 28 controls the element l2 for ground depthworking thereof, the lever 33 being latched in a manner as beforedescribed.

In the normal operation of the implement with the ground working elementI2 engaged in the soil, which is effected by having the draft bar [5latched in a rearmost position to the tongue [0, thus releasing thetension on the lift spring 38, so that the arm 26 will have swungrearwardly of the implement A, thereby causing the tongue ID to lower bythe weight of the ground working element l2, bringing it into its groundworking relation to the soil. Now, when the ground working element [2meets an abnormal resistance in the soil the draft arm or bar I5 onrelease thereof 4 during forward movement of the draft medium, such as atractor or the like, causes the bar l5 to slide forward which tensionsthe lift spring 38. Thus the lever 26 is moved in a forward directionturning the cranked axle causing the ground working element I 2 tobecome raised, lifting it out of the soil to relieve the abnormalresistance thereon and freeing the implement A therefrom.

What is claimed is:

A delayed acting power lift for a ground working machine having groundengaging wheels and a, raising and lowering tool-carrying framevertically shiftable relative to the wheels for bringing the machineinto and out of ground working positions comprising: a movable armconnected to the frame and the wheels for verticall shifting said frame,a displaceable draw bar forwardly of the arm, guide means on the framefor supporting the bar, hand controlled means for adjusting the arm toregulate the ground working position of the frame, an expansible andretractible tensioning element adjustably connected to the arm andfixedly attached to the bar for tensioning the arm on the bar beingdisplaced when the frame is in ground working position and resultantfrom abnormal resistance thereto for automatically effecting delayedvertical shifting action of the frame to bring the machineout of groundworking position, cushioning means for coaction with the guide means andthe draw bar, and a latch for the draw barto hold it in displacedposition for retracting the tensioning element.

DAVID K. MCGEHEE.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS

